Answer:
Dissolved or gaseous substances have to pass through the cell membrane to get into or out of a cell. Diffusion occurs when particles spread. ... They move from a region where they are in high concentration to a region where they are in low concentration.
Explanation:
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The medullary cavity in the long bone of an adult is primarily filled with YELLOW bone marrow
Answer:
Killer T-cells find and destroy infected cells that have been turned into virus-making factories. To do this they need to tell the difference between the infected cells and healthy cells with the help of special molecules called antigens. Killer T-cells are able to find the cells with viruses and destroy them.
Explanation:
Answer:
Your height, weight, etc.
Explanation:
The physical change is noticeable; one can observe.